As I see from previews hands that the guy just keeps 3betting you, one good advice. Just wait for a good hand then just 4bet him back and try to get in, don't use such hands has Q9o while he can easily just CBet the flop and where you have to give up, that could be even more than 85% of the time. Or just skip such hands if you are playing against such maniacs and wait for the right moment, that's all, shouldn't take much time.